%0 Journal Article %A V. A. Klyachin %A D. V. Shurkaeva %T Isoperimetry coefficient for simplex in the problem of approximation of~derivatives %J Izvestiya of Saratov University. Mathematics. Mechanics. Informatics %D 2015 %P 151-160 %V 15 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/ISU_2015_15_2_a3/ %G ru %F ISU_2015_15_2_a3